Solve by spreadsheet. A company has been discharging its waste into a holding po

Question

Solve by spreadsheet. A company has been discharging its waste into a holding pond for years. The pond is full and overflowing into a river for the last 6 months. The concentration of the primary waste in the pond is 35 mg/L. All of a sudden, the process changes and the concentration of the waste in the stream coming into the pond jumps to 250 mg/L. The pond is 500,000 L and the flow rate of the waste coming into it is 75,000 L/day. How many hours will it take until the waste concentration in the overflow stream going into the river reaches the danger level of 50 mg/L?

Note

Explanation / Answer

let the days required be x

therfore we have

let day = X

(250*75,000*X - 35*75,000X ) + 35*(500,000- 75,000*X)/ 500,000 = 50mg/l

henxe we get x = 0.4 days = 24 *.4 = 9.6 hrs

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